Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885656 | Digital protective relay | Wataru Kayamori | 1989-12-05 |
| 4853765 | Sequential scanning converter with frame comb filter and freeze frame feature | Kenji Katsumata, Masato Sugiyama, Takaaki Matono, Shigeru Hirahata, Isao Nakagawa +1 more | 1989-08-01 |